CN109855706A - A kind of negative-pressure pneumatic conveying experimental provision and experimental method - Google Patents
A kind of negative-pressure pneumatic conveying experimental provision and experimental method Download PDFInfo
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- CN109855706A CN109855706A CN201811577675.7A CN201811577675A CN109855706A CN 109855706 A CN109855706 A CN 109855706A CN 201811577675 A CN201811577675 A CN 201811577675A CN 109855706 A CN109855706 A CN 109855706A
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- 238000002474 experimental method Methods 0.000 title claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000000428 dust Substances 0.000 description 14
- 239000007787 solid Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 description 1
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Abstract
The invention belongs to Pneumatic pipe conveying technology fields, are related to negative-pressure pneumatic conveying experimental provision and experimental method.A kind of negative-pressure pneumatic conveying experimental provision, including negative pressure device, conveyance conduit, feeder；The front end of conveyance conduit is arranged in the feeder, and the end of conveyance conduit is arranged in negative pressure device；Mass flowmenter is provided on conveyance conduit between the feeder and negative pressure device；The lower section of the feeder is equipped with electronic scale.Negative-pressure pneumatic of the invention conveys experimental provision, experimental provision and Practical Project equipment are solved the problems, such as because of experimental error caused by the factor of scaling factor, flow regime of the material in pipeline in the case where different wind speed and different feeding capacities can be really simulated, the check precision of mass flow of materials meter is improved.
Description
Technical field
The invention belongs to Pneumatic pipe conveying technology fields, are related to negative-pressure pneumatic conveying experimental provision and experimental method.
Background technique
Pneumatic Conveying Technology refers to the energy using air-flow, along airflow direction conveying granular material in closed conduit.
According to the difference of pressure characteristic, air-transport system is divided into positive pneumatic conveying system and negative-pressure pneumatic transmission system.Negative pressure gas
Power conveying is the air in blower suction system by system end, forms negative pressure gas flow, air-flow carry material from suction nozzle into
Enter system and reach home, is finally separated by filtration and exhausts air in atmosphere.Air due to pipeline along Cheng Suoyou is
To internal leakage, safety and environmental protection, simultaneity factor can be from many places for shots suction and conveying material, and conveying is flexible and convenient, thus in logistics, energy
Source, chemical industry, metallurgy, agricultural, environmental protection, field are widely applied.But since pneumatic conveying is Dual-Phrase Distribution of Gas olid, situation
Sufficiently complex, the design of Pneumatic Conveying Technology, which calculates, is still in the experience stage.
Can in negative-pressure pneumatic conveying technology, the mass flow of solid material be important process operation parameter, accurate
Measurement directly affect process units stablize safe operation.The method of the mass flow measurement of material mainly has electricity at present
Method, microwave method, ray method etc..Since in Pneumatic Conveying Technology, Gas-solid Two-phase Flow is complicated in pipeline, such as different conveying
Under material and operating condition, especially pipeline section solid concentration measurement is uneven, can all influence solid mass flow meter
Accurate measurement, it is therefore desirable to which solid mass flow meter is demarcated.The main method that mass flowmenter is demarcated at present is
It is weighed by the material inlet amount of feed bin in feed system, according to weighing data to the mass flow rate of solid on feeding pipe
Meter is demarcated.
Scene carries out the mode of inlet amount weighing there are biggish defect, and the safety of stablizing for seriously affecting production technology is transported
Row.In actual production process, the pipeline for conveying material is connected with feed bin material metage first always, draws for the precision of weighing
Enter error；Secondly the Location Detection of Medium Transportation Pipeline of actual production is limited according to live place and is arranged, not necessarily has position that can install solid
Weight flowmeter brings difficulty for staking-out work；Finally, material in the reduction amount of material and Location Detection of Medium Transportation Pipeline in feed bin
Difference of the mass flow there are the time and spatially can not accurately realize that real-time online is demarcated.University, East China University of Science sets
A kind of calibration device for solid mass flow meter and application method and the system (CN200910050837.6) containing it have been counted, has been positive
Press air-transport system, it is difficult to complete the staking-out work of mass flowmenter in negative-pressure pneumatic transmission system.
Summary of the invention
Present invention aim to address problem of the prior art, a kind of negative-pressure pneumatic conveying experimental provision and experiment side are provided
Method.
The technical solution used to solve the technical problems of the present invention is that: a kind of negative-pressure pneumatic conveying experimental provision, including it is negative
Pressure device, conveyance conduit, feeder；The front end of conveyance conduit is arranged in the feeder, and negative pressure device is arranged in conveyance conduit
End；Mass flowmenter is provided on conveyance conduit between the feeder and negative pressure device；The lower section of the feeder
Equipped with electronic scale.
Further, the conveyance conduit is divided into three sections, is followed successively by horizontal segment, vertical section, horizontal segment；In each pipeline section
About calibration point installation quality flowmeter is arranged in middle position.
Further, the front of the mass flowmenter is equipped with visor, and rear is equipped with temperature sensor and pressure sensing
Device.
Further, the front pipeline of the feeder is equipped with air velocity transducer, temperature sensor and pressure sensing
Device.
Further, the conveyance conduit entrance is equipped with filter screen.
Further, the equipment and instrument installed on the conveyance conduit are tightly connected with conveyance conduit.
In order to solve technical problem of the invention, the present invention also provides a kind of negative-pressure pneumatics to convey experimental method, the party
Method the following steps are included:
(1) according to experiment demand, experiment material is put into feeder；
(2) negative pressure device is opened, adjusts wind speed according to requirement of experiment；
(3) pressure sensor pressure show value is observed, when pressure in material conveying pipe is stablized, feeder is opened, makes feeding
The feeding capacity of machine reaches the feeding capacity of requirement of experiment；
(4) Flow of Goods and Materials state in two levels and a vertical experiment pipeline section visor is observed, after Flow of Goods and Materials is stablized, often
Every the reading of 10s record electronic scale and the mass flowmenter reading of each pipeline section, while recording temperature and pressure at each pipeline section
Power；
(5) experiment carries out after obtaining enough realization data for a period of time, closes feeder；
(6) visor at three experiment pipeline sections is observed, closes negative pressure device after not having material remnant in pipeline；
(7) reading of a certain moment mass flowmenter is set as ZN, the reading of synchronization feeder lower section electronic scale is WN, use ZN
With (WN-1-WN+1The value of)/20s is checked, to complete the staking-out work of mass flowmenter.
Negative-pressure pneumatic of the invention conveys experimental provision, solves experimental provision and Practical Project equipment because of scaling factor
Experimental error problem caused by factor, material is in pipeline in the case where capable of really simulating different wind speed and different feeding capacities
In flow regime, improve mass flow of materials meter check precision.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of negative-pressure pneumatic conveying experimental provision of the invention.
Specific embodiment
Negative-pressure pneumatic conveying experimental provision of the invention and experimental method are made with reference to the accompanying drawings and examples detailed
Explanation.
Negative-pressure pneumatic of the invention conveys experimental provision, and structure connection is as shown in Figure 1, include mainly with flowering structure: industry
Dust catcher 1, air velocity transducer 4, feeder 5, temperature sensor 7, pressure sensor 8, electronic scale 9, visor 10, mass flowmenter
11, material conveying pipe 14.
Feeder 5 is connect by hose connector 15 with the front end of material conveying pipe 14.Feeder 5 and hose connector 15
Junction is equipped with check-valves 6.Feeder 5 is placed on electronic scale 9.As a kind of preferred embodiment of the invention, feeder 5
Motor is variable-frequency motor, and adjustable feeding capacity meets different experiments demand.
Industrial dust collector 1 is connect by dust collector hose 13 and reducer union 12 with the end of material conveying pipe 14.Work
Industry dust catcher can be different with the cooperation manually-operated gate opening-closing size generation of material conveying pipe inlet by different gears
Air quantity.
The entrance 3 of material delivery pipe 14 is equipped with filter screen 2.Entire material conveying pipe 14 is divided into entrance A, first
Horizontal segment B, vertical section C, the second horizontal segment D；Hand-operated valve 16 and air velocity transducer 4 are installed in entrance A.
Material delivery pipe 14 is steel tube, and caliber 102mm, dust collector hose 13 is plastic tube, caliber 50mm.
Feeder 5 is mounted on the front end of first horizontal segment B, front mounting temperature sensor 7, pressure sensor 8.Feeding
The rear of machine 5 is successively installed by visor 10, mass flowmenter 11, temperature sensor 7, pressure sensor 8.
Visor 10, mass flowmenter 11, temperature sensor 7, pressure sensor 8 are sequentially installed in vertical section C.
Visor 10, mass flowmenter 11, temperature sensor 7, pressure sensor are also sequentially installed on the second horizontal segment D
8。
In above-mentioned two horizontal segment and a vertical section, the about middle position of pipeline section is equipped with calibration point, quality stream
Meter 11 is mounted at the calibration point.
The equipment and instrument installed on material delivery pipe 14 are tightly connected with conveyance conduit.
Negative-pressure pneumatic of the invention conveys experimental method, and steps are as follows:
(1) mass flowmenter is mounted on by horizontal segment and vertical section on material delivery pipe according to experiment demand, material will be tested
It puts into 5 feeders；
(2) hand-operated valve 16 is opened, check-valves 6 is closed, opens industrial dust collector 1, by the impurity and last time experiment residual in pipeline
Experiment material be drawn into industrial dust collector, close industrial dust collector 1, by the dust settling pocket of industrial dust collector 1 impurity and
Material is cleaned out；
(3) it is again turned on industrial dust collector 1, adjusts the opening and closing degree of hand-operated valve 16, the wind speed for showing air velocity transducer 4 reaches
The wind speed of requirement of experiment；
(4) four groups of pressure sensor pressure show values are observed, when pressure in material conveying pipe is stablized, open check-valves 6, and
Feeder 5 is opened simultaneously, the variable-frequency motor of feeder 5 is adjusted, the feeding capacity of feeder 5 is made to reach the feeding capacity of requirement of experiment；
(5) Flow of Goods and Materials state in the visor of two horizontal segments and a vertical section is observed, after Flow of Goods and Materials is stablized, every
10s records the reading of the following electronic scale 9 of feeder 5 and tests the reading of pipeline section mass flowmenter, while recording each pipeline section
The temperature and pressure at place；
(6) experiment carries out after obtaining enough realization data for a period of time, closes feeder 5, closes check-valves 6；
(7) visor at three experiment pipeline sections is observed, industrial dust collector 1 is closed after not having material remnant in pipeline, closes hand
Dynamic valve 16, the material in the dust settling pocket in industrial dust collector 1 is cleaned up, material recycle station is put into；
(8) reading of a certain moment mass flowmenter is set as ZN, the reading of synchronization feeder lower section electronic scale is WN, use ZN
With (WN-1-WN+1The value of)/20s is checked, to complete the staking-out work of mass flowmenter.
Claims (7)
1. a kind of negative-pressure pneumatic conveys experimental provision, it is characterised in that: including negative pressure device, conveyance conduit, feeder；It is described to feed
The front end of conveyance conduit is arranged in material machine, and the end of conveyance conduit is arranged in negative pressure device；The feeder and negative pressure device it
Between conveyance conduit on be provided with mass flowmenter；The lower section of the feeder is equipped with electronic scale.
2. negative-pressure pneumatic according to claim 1 conveys experimental provision, it is characterised in that: the conveyance conduit is divided into three
Section, is followed successively by horizontal segment, vertical section, horizontal segment；In each pipeline section middle position installation quality flowmeter.
3. negative-pressure pneumatic according to claim 2 conveys experimental provision, it is characterised in that: before the mass flowmenter
Side is equipped with visor, and rear is equipped with temperature sensor and pressure sensor.
4. conveying experimental provision according to negative-pressure pneumatic described in claim 1, it is characterised in that: the front pipeline of the feeder
It is equipped with air velocity transducer, temperature sensor and pressure sensor.
5. negative-pressure pneumatic according to claim 1-4 conveys experimental provision, it is characterised in that: the delivery pipe
Road entrance is equipped with filter screen.
6. negative-pressure pneumatic according to claim 1-4 conveys experimental provision, it is characterised in that: the conveyance conduit
The equipment and instrument of upper installation are tightly connected with conveyance conduit.
7. a kind of negative-pressure pneumatic conveys experimental method, method includes the following steps:
(1) according to experiment demand, experiment material is put into feeder；
(2) negative pressure device is opened, adjusts wind speed according to requirement of experiment；
(3) pressure sensor pressure show value is observed, when pressure in material conveying pipe is stablized, feeder is opened, makes feeding
The feeding capacity of machine reaches the feeding capacity of requirement of experiment；
(4) Flow of Goods and Materials state in two levels and a vertical experiment pipeline section visor is observed, after Flow of Goods and Materials is stablized, often
Every the reading of 10s record electronic scale and the mass flowmenter reading of each pipeline section, while recording temperature and pressure at each pipeline section
Power；
(5) experiment carries out after obtaining enough realization data for a period of time, closes feeder；
(6) visor at three experiment pipeline sections is observed, closes negative pressure device after not having material remnant in pipeline；
(7) reading of a certain moment mass flowmenter is set as ZN, the reading of synchronization feeder lower section electronic scale is WN, use ZN
With (WN-1-WN+1The value of)/20s is checked, to complete the staking-out work of mass flowmenter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811577675.7A CN109855706B (en) | 2018-12-20 | 2018-12-20 | Negative pressure pneumatic conveying experimental device and experimental method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811577675.7A CN109855706B (en) | 2018-12-20 | 2018-12-20 | Negative pressure pneumatic conveying experimental device and experimental method |
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| Publication Number | Publication Date |
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| CN109855706A true CN109855706A (en) | 2019-06-07 |
| CN109855706B CN109855706B (en) | 2024-03-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111609993A (en) * | 2020-05-20 | 2020-09-01 | 华北水利水电大学 | Multifunctional circulating pneumatic conveying test system and test method |
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Inventor after: Wang Lei Inventor after: Liu Jie Inventor after: Su Xiaofei Inventor after: Jia Xinxin Inventor after: Yang Changhou Inventor after: Li Zunwei Inventor after: Wang Hu Inventor after: Wang Yanlong Inventor after: Zhang Hao Inventor after: Li Xianzhao Inventor after: Zhao Yanbo Inventor before: Li Zunwei Inventor before: Liu Jie Inventor before: Su Xiaofei Inventor before: Wang Hu Inventor before: Yang Changhou Inventor before: Jia Xinxin Inventor before: Wang Lei Inventor before: Wang Yanlong Inventor before: Zhang Hao Inventor before: Li Xianzhao Inventor before: Zhao Yanbo |
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